Further:
"auch sind i?e schon im 1300. Jahre an Preussen gekommene Uemter Tilsit, Ragnit, Memel, Insterburg n Schalauen, welches nebst Nadravien und einem Stücke von Sudauen auch Klein-Lithauen genennt und als eine besondere Landschafft ageschen wird, ebenfalls zu diesem Groß-herzogtum zu rechnen"
Author not counts so-called, known-as Lithuania Minor to Lithuania. He simply mentioned, but where is said it was part of Lithuania? There's no written it is 4th part. Later author tries to explain, gives all in that time known versions of etimology of the name.
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Including "Kleinlitauen" historically in (the Grand Duchy?? of) Lithuania is, of course, a blunder committed by many who saw that the rural population in Lithuania Minor before the Great Plague was up to 100 per cent Lithuanian.